forties
noun C2- The fifth decade of a century: the 1840s, 1940s, 2040s, etc. · My ma was born in the forties and my pa was born in the seventies.
- The decade of one's life from age 40 through age 49. · They're both in their forties.
- The range between 40 and 49. · What to wear when the weather is in the forties really depends on whether you're talking Fahrenheit or Celsius.
From the library
Chandler protracted his walk until the Forties began to intersect the great and glittering primrose way, for the evening was yet young, and when one is of the _beau monde_ only one day in seventy, one loves to protract the pleasure.
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